On the last day of the Time War, a man who refuses to call himself
“The Doctor” is faced with an appalling choice: in order to
end the bloodshed, he must use an ancient Time Lord weapon to slaughter
billions. Elsewhere, the Tenth Doctor hunts Zygons in Elizabethan
England, while in the present day, the Eleventh Doctor and Clara
investigate a mystery at an art gallery. All of these events become
intertwined, leading three incarnations of the same Time Lord to
confront the most terrible moment of their lives.